1) Chaos Bolt casting on you or not = threat issues aka use Gateway more often ....like every time its up.
2)Fel Puppies eating you or not = Pit Lord nearby and/or Threat issues. Move Pit Lord behind the pillar, soul shatter so that Kanrethad would attack him after, put him on neutral and aggro the fel puppies and kill em quick. Don't forget to macro stun when he is casting his cataclysm.
3)You don't need to LoS anything. If you keep using Gateway to drop threat there is no reason why any CB/DoTs would target you. If it is use Sac Pact to live and heal up ...although it should not happen. Have him on focus and use focus target to see who it is targeting while you are busy with w/e
4) There is no need to Banish anything really. If you keep using gateway then Pit Lord will tank everything.
5) if you are about hit hit enrage time keep Purification Potion hande to remove the Doom before it expires to give you few more min as by then you are probably dealing with 3 doomguards which can be tricky.

I killed it with around 500 ilvl (501 or something like that) without LoSing and just after 3rd fel puppy phase with just under 2min left on enrage. I was slow mainly because of the time i took to kill fel puppies.

1) Depending on your dps (not entirely dependent on item level, but rather your ability to maintain sufficient dps on kanrathad), banishing one of the doom lords can mean the difference between your pit lord surviving long enough for you to kill kanrethad or to wipe when it dies.
2) While it is true that using Gateway on cooldown will prevent any chaosbolts, using gateway on CD will never prevent Kanrethad from dotting you (though it is true that perfect upkeep of the Gateway threat drop can prevent Ultimate Doom from being cast until after the pit lord summoning).
3) There are only two (2) doomguard phases, thus having three doomguards active is impossible.
4) There are only two (2) fel puppy phases, so having a third fell puppy phase is impossible (and thus having killed him just after said third phase is impossible). I tend to agree with Roflifier

Having more fun is indeed what counts in a game, however I can say that while I may have been frustrated to no end while working on this encounter, the feeling you get when you finally topple him is one of the best you will ever experience in WoW. I truly urge you to keep at it and down him before he is nerfed (either by simply outgearing or mechanics).

As someone who racked up around 2-3k in repairs bills doing this fight, my only advice is to stick with it, but if your getting frustrated take a break that day, do something else and come back to it.

I did it with around 483 ilevel, and spent a lot of time doing and perfecting my reactions to the fight and checking up on various threads to make sure I wasn't missing anything (it was only after many deaths that I realised where that damned imp and his stunning and void zones was coming from as that caused me many wipes).

The main strat's mentioned here about using Gatway as soon as it's available to keep threat dropped worked for me, rarely in my attempts did I have a chaos bolt on me and towards the last few tries don't think I had a single one. My main trouble was always making sure the Pit Lord was hidden away during Fel Pup stages and making sure they aggro'd on me and I got them down quick enough to be able to deal with the next phase, and the panic moment after 2nd fel pup when you realise enslave has run out and Pit Lord is running at you while you still have a pup or two alive.

PS. Don't do this after an op, you think the repair bills and frustration from the fight are bad, try popping 2 stitches because you've tensed up so much when you finally succeed and having to dash up A&E after you got green fire, not the best way to celebrate victory!

PPS. The glyph that allows gateway use without clicking is a god-send on this fight, found clicking quite often failed and the glyph gets rid of all that issue so you can make sure you get most use of the gateway.

It sucks that I outgeared it so much, at 515+ it's pretty much a cake walk once you have the tactics down. Still an awesome fight tho! Just relax, don't take it too serious

You can always go back and do it again without some gear. I found it very satisfying at ilevel ~490. Personally I'm looking forward to going in there at ~530 just to make sure he remembers what's what, lol.

Yea it was a pretty intense fight, once you start reaching around 10% and you can see light at the end of the tunnel it's hard to calm your heart rate down. I only wish more had gone into the quest-line/scenario leading up to the fight; an extremely intense and epic conclusion a not so epic quest-line.

You can always go back and do it again without some gear. I found it very satisfying at ilevel ~490. Personally I'm looking forward to going in there at ~530 just to make sure he remembers what's what, lol.

I'm doing it in 480 average ilvl PvP gear, so it's pretty hard :P

Originally Posted by Xandy

Yea it was a pretty intense fight, once you start reaching around 10% and you can see light at the end of the tunnel it's hard to calm your heart rate down. I only wish more had gone into the quest-line/scenario leading up to the fight; an extremely intense and epic conclusion a not so epic quest-line.

I had the same thought. I originally started this questline purely for the lore of it and it hasn't been living up to my expectations so far. Hopefully the conclusion is epic I haven't seen it, so no spoilers!).

It sucks that I outgeared it so much, at 515+ it's pretty much a cake walk once you have the tactics down. Still an awesome fight tho! Just relax, don't take it too serious

I was 491 and it was still pretty tough. I'm sure I was upward of 50 attempts. Ill admit I didn't research nearly enough so I think I made it alot harder on myself:

-didn't know the Pit Lords breath removed debuffs.
-didn't know his heal also healed me
-didn't know his charge made the boss take 100% more damage
-never attempted to LOS the pit lord, I would rain of fire the portal and teleport away so that the Enslave was never dispelled

These things would have made things much easier. The fight is very intense, definitely gets your blood flowing. Best solo experience in Wow, easily. They did an awesome job and I hope to see more things like this for other classes.

Well, it's been done at pretty low ilevels - at least ~476 I believe, which is the brilliant thing about it. It's about execution more than gear so hang in there!!!

Originally Posted by Goremaw

....They did an awesome job and I hope to see more things like this for other classes.

This. I hope very much that they are using this as a sort of litmus test to perhaps introduce other solo class scenarios. I thought maybe there was a blue post that alluded to that, but I can't seem to find it.

I had the same thought. I originally started this questline purely for the lore of it and it hasn't been living up to my expectations so far. Hopefully the conclusion is epic I haven't seen it, so no spoilers!).

You can do it in lower ilvl, your strategy is what matters. I so wanted to make an youtube guide for it but I don't know, I couldn't make it as clear as I wanted no matter how much effort I put into it.
If you are getting it so low, you will get down eventually. You might already know this from a guide or something (I'd be amazed if no one did it by now) but the way to kill it is maximizing the pet stuns on it. Be close to it when when you stun it and start casting Chaos Bolt BEFORE the stun, stunning him when CB is like 75% cast!
Basically: Pitlord spawns, mortal coil it, enslave (with enslave glyph because LOL SPEED) instant stun, stun when he's summoning imps(or on CD), stun on CD after every Cataclysm but be sure you don't stun him BETWEEN A SUMMON and a CATACLYSM. If you stun him when he's ~90% done with summoning, you will have the CD for next Cataclysm.

I did it in 522 ilvl gear on live to steam roll it but I had 16 hours of FRAPS'ed footage on him and did it as low as 463 ilvl. I guess I did my share of it on PTR.

Ah cant really say, only to support and claim that i feel you bro, did it on the first days of 5.2 as 480 pvp ( there wernt any good strats back then) and after sub 10% wipes i didnt knew what to do with myself i kept walking around the house for around 5min just to calm myself.